Light projector



Dec. 15, 1931.

C. A. B HALVORSON. JR

LIGHT PROJ ECTOR Filed Dec. '7, 1927 2 Sheets-Sheet Hus Attorneg.

Dec. 15, 1931. c. A. B. HALVORSON. JR

' LIGHT PROJECTOR Filed Dec. '7,

1927 2 Sheets-Sheet 2 mmr- I Maw m m a E v mm/ t a m f m v t .mA A w .6W H w: m F C .W.

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Patented Dec. 15, 1931 UNITED STATES PATENT OFFICE CROMWELI: A. B.HALVORSON, JB., OF LYNN, MASSACHUSETTS ASSIGNOR TO GENERAL ELECTRICCOMPANY, A CORPORATION OF NEW YORK LIGHT PBOJ'EGTOR Application filedDecember 7, 1927. Serial No. 288,430.

My invention relates to light projectors. More particularly it relatesto projectors of the type which are especially adapted for use assignalling devices, such as traflic signals.

Among the objects of my invention are the following: i

To provide a light projector comprising a frame provided with one ormore doors,

the door being provided with a lens or cover as well on the same hingedsupport, the light.

source being preferably in the form of an electric light supported in asocket, the socket being secured to the said frame work and the lightsource projecting from the socket through an opening in said frame workand through an opening in said reflector;

To provide a latch for latching the refiector and the door structuretogether: in order to protect the projector and the lens a gasket isprovided between the lens and the reflector. the latch operating to holdthe reflector tightly against the gasket;

To provide a device of the foregoing character in which each doorconstitutes a unit projector including the light source, the socket, thereflector and the lens, making it possible to remove the unit byremoving the door and by substituting one type of unit for another bymerely substituting a new door unit;

To provide a projector of the foregoing character in which the variousunits may be readily adjusted so that the beams may be adjusted withrespect to each other; in other words, it is an object of the inventionto provide a signalling device comprising a plurality of units, theunits being so supported that the beams may be each adjustedhorizontally.

The invention also comprises other fea tures herein more fully set forthand claimed. However, the invention will be more readily understood fromthe following specification, reference being had to the accompanyingdrawings, in which Fig. 1 shows in perspective a projector embod 'ingthe features. of my invention and consisting of four units; Fig. 2 is anenlarged perspective view of another form of the device with only oneunit shown in position; Fig. 3 is a top view partly in section of thedevice of the invention showing four units; Fig. 4: is a perspectiverear View of one of the units.

Referring more in detail to the drawings and in particular Fig. 2, theprojector there shown comprises a square frame 2 having an opening ineach one of the four faces, said faces being at right angles, of course,to the top and bottom planes of the frame. With the type of unit shownin Fig. 2 I provide an adjustable drum 3. This drum is seatedin'bearings in the right hand opening of the frame in Fig. 2. One of thebearings 4 is shown in Figs. 2 and 3. The opposite bearing 5 is shown inFig. 3. Each of the other windows is provided with correspondingbearings 6 and 7, 8 and 9, 10 and 11,-as indicated in Fig. 3. Threeadditional drums 12, 13 and 14 are provided, one in each of theremaining windows. These four drums 3, 12, 13, and 14 are held togetherby means of a ring 15 and bolts 16, 17, 18 and 19. As clearly indicatedin Figs. 2 and 3, each of the drums is provided with a slot such as theslot 20 which enables the drum to be adjusted in its bearing withrespect to the ring 15. It will be seen that by means of the bolts 16,17, 18 and 19 the drums may be tightly drawn against their respectivebearings after the units have been adjusted with respect to the beam.v

In the form of device shown in Figs. 2 and 3 it will be seen that eachunit comprises a door such as the door 21 also shown in Fig. 4. Thisdoor is provided with suitable hinges 22, the door being hinged to thedrum 3 by means of a pin 23. Around the rim of the door there isprovided a gasket element 24 in order to render the unit dust-proof andto protect the device against injurious jar. Each unit comprises also areflector element 25, the reflector being supported on a hinge structuresecured to the frame of the door. This hinge structure comprises arms 26and a central holder element 27, the latter being provided with meansfor securing the reflector in position as indicated in Figs. 3 and 4.This means may, comprise screws 28. The holder 27 is secured to the arms26 by means of the hinge comprising a bolt 29. Obviously therefor thereflector may be swung about an axis extending through the bolts 30 andmay also be rotated about an axis through the bolt 29.

The holder- 27 is further provided with a collar 31, the rear portion ofwhich is integral with the element 27, but the forward portions 32 ofwhich are cut away from the body 27 in order to render the forwardportion of the collar resilient. The forward portions 32 of the collarare under the control of a screw 33, the arrangement being such that thesocket 34 for holding the electric lamp may be inserted in the collar 31and then clamped in position by means of the screw 33.

Referring to Fig. 3, it will be seen that the socket 34 projects throughan opening in the holder 27 and that beyond the socket the electric lamp34a projects through an opening in the central portion of the reflectorelement 25.

In order to latch the reflector in position as indicated in Fig. 4 Iprovide a bail latch 35 which is pivoted at the pins 36, the pins 36being secured to the door frame.

The lens 37 is held in the door between two gasket elements in order toprotect the lens or cover glass from the frame of the door and from therim of, the reflector, and to effect a tight joint, one of the asketsbeing located in front of the lens am? the other gasket being locatedbehind the lens. It will be seen that each of the units may be providedwith a hood 38. For the purpose of latching the unit in closed positionwith respect to the drum 3, I provide a suitable latch comprising aprong element 39 on the door antl a hinged bolt and wind nut element 40.

It will be understood that in the event that a unit is desiredconsisting of a number of frames such-as shown in Figs. 2 and 3 stackedone above the other as is customary, such units may be stacked one abovethe other and clamped together as for example by means of bolts 41. Theunit may be provided with any suitable form of cover and bottom such asa plate 42, see Fig. 1.

It will be understood that while I have disclosed my invention inconnection with the specific form of device shown in the drawings, I donot wish to be limited to this particular form inasmuch as in view ofthe dis closure, those versed in the art will readily percelve thatmodifications may be made of the character clearly within the spirit ofthe invention and the scope of the claims contained herein.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is

1. In a lighting unit, the combination of a casing adapted to occupy afixed position, a door hinged to the casing at one edge whereby it isfree to swing away from the casing, said door having an opening, a lensmounted on said door over said opening, a-supporting means pivoted alongone edge of and at the rear of the door, said supporting means beingadapted to project toward the center of the door, a reflector and lampunit hinged adjacent to its central portion to the supporting means, andmeans for fastening the reflector and lamp unit to the door, with thereflector in position behind the lens.

2. In a lighting unit, the combination of a casing adapted to occupy afixed position, a door hinged to the casing at one edge whereby it isfree to swing away from the casing, said door having an opening, a lensmounted on said door over said opening, supporting arms pivoted at oneend adjacent to one edge of and at the rear of the door, said armsprojecting toward the center of the door, a

reflector and lamp unit hinged adjacent to its central portion on theother ends of said arms, and a latch for fastening the reflector andlamp unit to the door, with the reflector in position behind the lens.

In witness whereof, I have hereunto set my hand this fifth day ofDecember, 1927.

CROMWELL A. B. HALVORSON, Jr.

